/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : Main program body.
 *********************************************************************************
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * Attention: This software (modified or not) and binary are used for 
 * microcontroller manufactured by Nanjing Qinheng Microelectronics.
 *******************************************************************************/

/*
 *@Note
 *BKP routine:
 *Intrusion detection pin (PC13), when an intrusion detection event occurs, 
 *all data backup register contents are cleared,And trigger the intrusion 
 *detection interrupt.
 *
*/

#include "debug.h"

/*********************************************************************
 * @fn      BKP_Tamper_Init
 *
 * @brief   Initializes the BKP Tamper.
 *
 * @return  none
 */
void BKP_Tamper_Init(void)
{
	NVIC_InitTypeDef NVIC_InitStructure={0};
	
	RCC_APB1PeriphClockCmd( RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE );	

	BKP_TamperPinCmd( DISABLE );	
    PWR_BackupAccessCmd( ENABLE );
    BKP_ClearFlag();
	
	BKP_WriteBackupRegister( BKP_DR1, 0x9880 );	
	BKP_WriteBackupRegister( BKP_DR2, 0x5678 );
	BKP_WriteBackupRegister( BKP_DR3, 0xABCD );
	BKP_WriteBackupRegister( BKP_DR4, 0x3456 );
	
	printf( "BKP_DR1:%08x\r\n", BKP->DATAR1 );	
	printf( "BKP_DR2:%08x\r\n", BKP->DATAR2 );	
	printf( "BKP_DR3:%08x\r\n", BKP->DATAR3 );	
  printf( "BKP_DR4:%08x\r\n", BKP->DATAR4 );	
	
//	BKP_TamperPinLevelConfig( BKP_TamperPinLevel_High );  //TPAL:0,PC13 set input-pull-down	
	BKP_TamperPinLevelConfig( BKP_TamperPinLevel_Low );	 //TPAL:1,PC13 input-pull-up	
	
	NVIC_InitStructure.NVIC_IRQChannel = TAMPER_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init( &NVIC_InitStructure );
	
	BKP_ITConfig( ENABLE );	
	BKP_TamperPinCmd( ENABLE );		
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
	SystemCoreClockUpdate();
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
	USART_Printf_Init(115200);
	printf("SystemClk:%d\r\n",SystemCoreClock);
	printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
	
	BKP_Tamper_Init();
	
	while(1);
}

/*********************************************************************
 * @fn      TAMPER_IRQHandler
 *
 * @brief   This function handles SysTick Handler.
 *
 * @return  none
 */
void TAMPER_IRQHandler(void)
{
  if( BKP_GetITStatus() == SET )
	{
		printf("TAMPER_IRQHandler\r\n");
		printf( "BKP_DR1:%08x\r\n", BKP->DATAR1 );	
	  printf( "BKP_DR2:%08x\r\n", BKP->DATAR2 );	
	  printf( "BKP_DR3:%08x\r\n", BKP->DATAR3 );	
    printf( "BKP_DR4:%08x\r\n", BKP->DATAR4 );
	}
	
	BKP_ClearITPendingBit();
}
